Một vật dao động theo phương trình $x=4.cos\left(\frac{\pi t}{6}\right)\left(cm\right)$ (t đo bằng giây). Tại thời điểm t1 li độ là $2\sqrt{3}$cm và đang giảm. Tính li độ sau thời điểm t1 là 3 (s).

Hệ thống thuộc địa thế giới ban đầu đem lại nhiều quyền lợi cho những nước nào?

Read the following passage about Unconventional Teachers Who Changed Lives and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.

Traditional education focuses on textbooks, but some teachers go beyond these limitations. Mrs. Rodriguez transformed her classroom into a living laboratory. Her students conducted experiments with plants and simple machines. She believed hands-on learning creates deeper understanding than reading alone. When asked why she taught differently, she replied, "I want students to fall in love with discovery." Her methods helped struggling students improve and develop passion for science.

Mr. Jackson abandoned lectures for storytelling and role-playing. His students experienced history by acting out important moments. This approach made history come alive and helped them remember key information. One student said, "Before Mr. Jackson's class, I thought history was boring, but he showed us it's fascinating." He took classes to historical sites and invited veterans to share experiences. These connections helped students understand how past shapes our present.

In a remote village, Ms. Chen taught English without proper textbooks. She created materials using newspapers and song lyrics. Despite limited resources, her students achieved remarkable results through her dedication. "Learning should be joyful, not painful," she told questioning parents. Ms. Chen organized conversation clubs and pen pal exchanges. These activities gave students practical language skills and confidence to use English in real situations.

Coach Williams was a life mentor who taught valuable lessons through sports. He focused on teamwork and fair play rather than winning. Students who struggled academically often excelled in his class. "The playing field is where children learn who they truly are," he explained. He created inclusive activities for all students regardless of athletic ability. Many former students credit him with teaching life skills like resilience and cooperation that helped them succeed after graduation.

The word “them” in paragraph 2 refers to _________.

Gọi \(S\) là tập hợp các số tự nhiên có 6 chữ số. Chọn ngẫu nhiên một số từ \(S\), xác suất để các chữ số của số đó đôi một khác nhau và phải có mặt chữ số 0 và 1 bằng

Hãy chọn câu phát biểu đúng nhất khi nói về hệ điều hành?

Một sợi dây đàn hồi căng ngang, hai đầu cố định đang có sóng dừng, tốc độ truyền sóng không đổi. Khi tần số sóng là 52 Hz thì trên dây có 4 điểm bụng. Muốn trên dây đó có 5 điểm bụng thì tần số sóng phải thay đổi một lượng là

Xác định một từ/cụm từ SAI về ngữ pháp/hoặc ngữ nghĩa/logic/phong cách.

Với từng cá nhân, AI rất hữu ích trong việc thay đổi cách dạy và cách học của giáo viên và học sinh, nhưng việc nỗ lực biến các công cụ này thành công cụ hỗ trợ chính thức trong các cơ quan hành chính chưa đem lại kết quả khả quan.

Students had better _________ future employment opportunities when choosing their major in college.

Chị C là nội trợ thường xuyên đi siêu thị để mua thực phẩm và các đồ gia dụng trong nhà. Trong trường hợp này chi C đóng vai trò là chủ thể gì của nền kinh tế?

Ở châu Á, quốc gia nào phát triển mạnh năng lượng tái tạo?

Sentence rewriting: Digital reading may be better for students than print reading.

Read the following passage about education in Nepal and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40. 

Fashion in the 1960s reflected the cultural and political upheaval of the time. The hippie and counterculture movement gave rise to accessories like Pocahontas-style headbands and medallions worn around the neck. Hippies wore long, loosely fitting clothing, often in natural fabrics. Hemlines rose as Mary Quant popularized the miniskirt and hot pants in her lines for JC Penney. And mod fashion, with brightly colored space-age geometric patterns, shift dresses and colored tights became the mainstream. Both miniskirts and mod-shift dresses were worn with knee-high go-go boots.

[A] During the 1970s, the loose-fitting hippie clothes of the prior decade gave way to exotic fabrics and bell-bottom jeans for men and women. Hemlines continued to rise and hot pants continued their popularity, reflecting the flashy style of the decade. However, the 1970s also saw the popularity of a longer hemline, from mid-calf to ankle-length. [B] Women wore peasant-style clothing, especially blouses with off-the-shoulder necklines and lace trim, with their jeans or skirts. [C] Disco fashion emerged, featuring bright patterns and tightly fitting clothing meant to show off the body. Platform shoes elevated their wearer, male or female, anywhere from two to four inches or more. [D]

The 1980s saw another fashion upheaval. Angst-ridden punks wore Dr. Marten and steel-toed army boots, chains, tartan patterns, and bondage pants. Punks focused more on their hair during this period, dying, teasing and chopping their hair into asymmetric styles that seemed to defy gravity. Women—and men—experimented with heavy eyeliner in a variety of colors. Women wore neon colors, jelly shoes, tight jeans, leggings, leg warmers and oversized sweatshirts. Menswear-inspired looks also became popular for both sexes. Men wore ‘power suits,’ named so for their price, which made these suits a reflection of the wealth of the wearer. Women’s jackets featured big shoulder pads that made the shoulders appear higher and larger, similar to the male silhouette.

1990’s fashion was far more subdued than the garish, wild styles of the 1980s. Bands like Nirvana influenced the grunge look, which featured rock-concert tee shirts under plaid flannel shirts, jeans and long, greasy hair. Overalls were worn by both sexes, either with one or both shoulder straps unhooked. The punk style of the 1870s and 1980s evolved into the goth fashion trend, which featured black clothing, black boots and studded bracelets in the style of bands like Nine Inch Nails and Marilyn Manson.

What can be inferred from accessories like Pocahontas-style headbands?

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions:

            For many people who live in cities, parks are an important part of the landscape. They provide a place for people to relax and play sports, as well as a refuge from the often harsh environment of a city. What people often overlook is that parks also provide considerable environmental benefits.

            One benefit of parks is that plants absorb carbon dioxide - a key pollutant - and emit oxygen, which humans need to breathe. According to one study, an acre of trees can absorb the same amount of carbon dioxide that a typical car emits in 11,000 miles of driving. Parks also make cities cooler. Scientists have long noted what is called the Urban Heat Island Effect: building materials such as metal, concrete, and asphalt absorb much more of the sun’s heat and release it much more quickly than organic surfaces like trees and grass. Because city landscapes contain so much of these building materials, cities are usually warmer than surrounding rural areas. Parks and other green spaces help to mitigate the Urban Heat Island Effect.

            Unfortunately, many cities cannot easily create more parks because most land is already being used for buildings, roads, parking lots, and other essential parts of the urban environment. However, cities could benefit from many of the positive effects of parks by encouraging citizens to create another type of green space: rooftop gardens. While most people would not think of starting a garden on their roof, human beings have been planting gardens on rooftops for thousands of years. Some rooftop gardens are very complex and require complicated engineering, but others are simple container gardens that anyone can create with the investment of a few hundred dollars and a few hours of work.

            Rooftop gardens provide many of the same benefits as other urban park and garden spaces, but without taking up the much-needed land. Like parks, rooftop gardens help to replace carbon dioxide in the air with nourishing oxygen. They also help to lessen the Urban Heat Island Effect, which can save people money.

            In the summer, rooftop gardens prevent buildings from absorbing heat from the sun, which can significantly reduce cooling bills. In the winter, gardens help hold in the heat that materials like brick and concrete radiate so quickly, leading to savings on heating bills. Rooftop vegetable and herb gardens can also provide fresh food for city dwellers, saving them money and making their diets healthier. Rooftop gardens are not only something everyone can enjoy, they are also a smart environmental investment.

Question 38: Based on the information in paragraph 3, which of the following best describes the main difference between parks and rooftop gardens?

Tìm tất cả các giá trị của tham số \(m\) để hàm số \(y=\frac{x^{2}+m}{x^{2}-3 x+2}\) có đúng 1 tiệm cận đứng?

Cho dãy các chất: tinh bột, cellulose, glucose, saccharose. Số chất trong dãy thuộc loại disaccharide là bao nhiêu?

Cho hàm số \(f(x)=-x^{3}+m x^{2}-\left(m^{2}+m+1\right) x\). Với \(m\) là tham số thực.

Với \(m=2\) thì giá trị nhỏ nhất của hàm số \(y=f(x)\) trên đoạn \([0; 4]\) bằng:

Động mạch được cấu tạo bởi mấy lớp?

Each family member need to develop certain traits and skills and then practice being a strong and supportive member of the family.

Với Access, muốn tạo biểu mẫu theo cách tự thiết kế, ta chọn lệnh nào sau đây?